From your local machine, login to the newly created VSI by running the following command (Note: After the VSI is in running state, you might still need to wait a few minutes before you can connect to it via ssh).
ssh -J root@<jump-node-ip> root@<new-instance-ip>
You should find the jump-node-ip from the ssh login command generated while creating the existing LSF cluster.
Now customize the software on the VSI boot volume.